Keystones — Capstone
Five GCSE retrieval questions · 15 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² - 7x - 11
Answer: (x - 7⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 13cm, angle = 63°. Give your answer to 2 decimal places
Answer: 75.29cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 24:42:49 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 97, 38, 14, 62, 70, 90, 86. Give your answer to 2 decimal places
Answer: Mean = 60.13, Median = 66, Range = 83